The ECU now has default numbers in its trim memory - it has to adjust them to match the tune of your engine and its sensors and actuators. Hello Forum, New here, and I'm having a bit of an issue. Start car A, put battery in car B, start car B. It might take a day or two of driving in traffic before the engine will settle down again. Some vehicles have an idle relearn period or even a procedure when the battery is disconnected. But glad it worked for others. So my thinking is that the missing signal from the MAF is keeping the ECU from using input from the actual failing sensor, ll. Regards, John Fishbeck Haslett MI Soon thereafter, it will seem to fix itself. After recently disconnecting the battery and replacing a headlamp fuse and a headlamp, my 2003 Toyota Camry will now run very rough and die soon after starting. Do this with the negative cable DISCONNECTED from the battery. Strange. 12,610 Posts #2 • Nov 24, 2011. You then have to rebuild the program by satisfying a variety of driving conditions like a 0 - 60mph acceleration, cursing at 60mph for X amount of time, and so on. Your truck's Adaptive Memory is a "learned value" that your Powertrain Control Monitor (PCM) has memorized from your driving habits and engine's idle pattern. 1) Disconnect the negative battery terminal. Put battery back in car A, and battery back in car … Sometimes when the battery is run low or disconnected the throttle body and ECM ... nothing to worry about on that one. This is … The short circuit you’re creating here is designed to drain all power from the capacitors inside the PCM. They scanned the on-board computer and probably reset the idle air control (IAC) valve or PCM. From what i've heard, after replacing the battery, the memory does clear but if drive around for a while, the memory would come back and all is good, but if that is the case, the dealer forgot to mention that to me and instead stuck me with a bill that i really didn't have to pay for. If it is running rough, something is not right with the plug install. Except this time the idle was perfectly normal no really low idle. On the 2008 I'm even running a tune, optimized throttle body, larger throttle body, etc and this has never happened after a battery disconnect. Was that psychosomatic or does the battery really affect how an engine runs? Battery was disconnected entire time, and the car had been sitting overnight ('stone cold'). to do so, I had to disconnect the battery to see what I was doing and fit my hand. Alternator Problems. The series 5 model has an electronics issue that keeps discharging the battery. I don't understand why, but it seems to fix itself. I just had this same problem replace the battery and the car does not idle, and will only stay running if the gas pedal is held down a little bit. I have a Mazda 3 2.0i w/ 85,000 miles. Ran through a huge puddle with my car and it started running rough, lost its power, the check engine light was blinking and after 2-3 miles it died. Love it when a plan comes together. My car has 90000 miles. My car has an automatic transmission. This article applies to the Ford F-150 (2004-2014) and the F-250, F-350 Super Duty (2005-2014). 6) If you miss the symptoms in the first week or so after a battery disconnect then the idle correction still keeps learning - as does the long term trim correction. The reason I cleaned the throttle body was mostly because of that horrible low idle when I replaced the battery earlier this year. When I reconnected the battery and went to start the car, it started as normal for about 1 second, then died. The engine may run rough or idle poorly right after ECU reset. I'm sure it's the battery. After cleaning the throttle body the Engine was idling weird (Reving high). Today, I replaced the drivers side headlight on my 2002 es300. How to fix a bad idle or stalling that can occur after you've disconnected the battery. Your problem was probably not the battery nor the alternator. Once started the car ran really rough with the rpms ranging from 0-1000 and struggling to stay running. Assuming that you have a healthy car with no other problems the below procedure should work for you. After reinstalling the battery the car would barely idle. I had no issues with it before I disconnected the battery, so I doubt it is the alternator. As a result the car will usually sort out the idle problems after a week of running. The car was running just fine yesterday and even running fine smoothly when I got it turned on in the morning. 2) Run a jumper wire from the positive battery cable to the now disconnected negative battery cable terminal. ... rough idle is the problem, you need to do the idle learn procedure for your car . But if the car isn't being run often, the battery will slowly drain over time and soon won't have enough juice to send the necessary voltage to the starter. Remember that the car runs when it is disconnected. Battery problems can quickly arise from alternator problems. I’ve read where changing the battery may affect a car’s idle and have since disconnected the battery terminals (both) and reconnected them after 30 minutes. If you try to plug it in while it's running the car will die. What you need to do is remove the battery cables again, leave it for about an hour or so, and hook them back up. I've seen it more than once when a vehicle has the battery disconnected for a long repair that it has running issues later. As long as the car is being run fairly often the battery can be continuously recharged and ready for use. I have a 2005 Outback 2.5i. Disconnecting Negative Battery Cable When Car Is Running ... to test the voltage of the battery while the car is running, and test the amps when the car is shut ... still got the car running rough at idle and despite artscots best efforts in previous posts and my vain attempts at diagnostics i still havnt resolved it. Tested the charging system, working fine. Usually happens after driving around and letting it idle here and there. If it runs generally good with no CEL then run it a bit longer to see if it improves. We replace them on our lot ALL OF THE TIME when brand new cars are not started for awhile and the battery gets 100% depleated. Thanks I re-connected the battery and followed Uncle Scotty's procedure, and the car is running like a top. what this will do is it will reset the cars computer to it's default settings. I asked for help on this site, got a few helpful tips but idk what to do further. They said the computer might lose some data after battery was disconnected. I also noticed that it was only drawing -10psi of vacuum at idle when it … I've had my battery out a couple times and every time I replace the battery, the car idles rough or stalls. I've never experienced this problem before on both my 2.3 liter (2007 and 2008) Mazda 3's. Q: If you unplug the mass air flow sensor the car will start. ... Also to reset the adaptations you can try and to reset it by disconnecting both battery terminals and touching both cables together for about 5 minutes. Disconnect the negative battery cable and connect the probe ends of a digital multimeter -- set to read volts DC -- to the negative and positive battery terminals. I did not fully snap in a couple of connectors when installing plugs, so that could be going on. The battery does act like a big capacitor in a way, so it's not recommended to run with it disconnected for long. 4. Don't worry takes about 70 miles if I remember correctly 11 Tundra CM 4x4 TRD Offroad, Spruce Mica, Zone 3/1, 20x9 XD Black Hoss, 35x12.5x20 Nitto Trail Grappler, TRD Skidplate, Sunroof, Cold Weather Package, Clarion NX501 NAV/DVD, 2 DC Audio 10's, custom ported box, CT Sounds 1400.1D, XenonVision HID's, Plasmaglow Fire and Ice Light Bar, Rhino … NOTE. The alternator should output from 13.5 to 15.5 volts with the engine running at ... need to "re learn " how to idle after having the battery disconnected. If I disconnect the battery in my car for what ever reason I … I’ve then let the car idle on it’s own for about another 10. Even if that is not the issue car batteries eventually fail even if properly maintained. I've done it before when stuck with a flat battery without any jumper leads. Why? Hi! Before dying, there was a smell in the passenger compartment, i dont know if of gas or burning oil. I never had disconnected the battery while the car is running, just disconnected it waited for 10 min, and connected it again to clear anything that may have been causing the idle problem. My battery has been showing signs of becoming weak so I replaced it today and after installing it I proceeded to start my car which took much longer to crank than usual but after a few seconds it started. RX-8 Stalls After Battery Disconnected This is a brief guide to a possible solution for those that have problems with the car idling after your battery has been disconnected and the ECU reset. Last night I replaced the original battery and took the car for a good drive to make sure the new one was charged. The simplest way to check for a bad ground is to run a continuity test between the battery and the chassis. Had to drive the car with right foot on gas and left foot on brake for 1.5 miles to a nearby mechanic shop. Also flat spots are a concern even on newer cars, but they should work there way out in a few miles. It is unlikely. I drive a 1999 Sable. The car seemed to run a lot more smoothly and maybe even more quietly. Last Saturday, the car wouldn't turnover (partially due to the cold, partially due to it having a 5 year old battery). Sometimes it the engine will cut out right away and sometimes it will run for a while, but still very rough. It's normal after a battery disconnect. So I did the whole 1 hour disconnect battery to reset the computer. Worst case is the battery is so flat you need to replace it, Factory Honda batterys are not great when run down. 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